Update changelog for 3.0.0-2 release

debian/changelog

+visp (3.0.0-2) unstable; urgency=medium
+
+  * Fix missing Breaks/Replaces relation to fix upgrade from
+    testing (Closes: #810354)
+  * Switch to libusb-1.0 (Closes: #810464)
+  * Introduce patches to fix issues
+
+ -- Fabien Spindler <Fabien.Spindler@inria.fr>  Sat, 09 Jan 2016 18:23:36 +0100
+
 visp (3.0.0-1) unstable; urgency=medium
 
   * Update watch file since website migration